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Finding the Fourth Proportional to 748.68, 1,122.88 and 286.30

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Solution

The fourth proportional to 748.68, 1,122.88 and 286.30 is: 429.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.68 : 1,122.88 = 286.30 : x
  2. Step 2: Convert to fraction form
    748.68/1,122.88 = 286.30/x
  3. Step 3: Cross multiply
    748.68x = 1,122.88 × 286.30
  4. Step 4: Simplify right side
    748.68x = 321,480.54
  5. Step 5: Solve for x
    x = 321,480.54/748.68
  6. Step 6: Final answer
    x = 429.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.